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Copied from Alpine-usa.com support page:
Setting item: CLOCK ADJUST
Further setting items : HOUR / MINUTE / TIME ADJUST
Setting content: 1-12 / 0-59 / RESET
• The clock-adjusting mode is canceled when the power is turned off,
when [RETURN] or [CONTROL] is touched.
Setting item: DAYLIGHT SAVING TIME
Setting content: OFF / ON
Setting the Time
HOUR: Adjust the hour.
MINUTE: Adjust the minute.
RESET: If the clock shows less than 30 minutes past, the
minute will be “: 0”; more than 30, the hour
advances.
Setting Daylight Saving Time
ON: Place the Summer Time mode ON. The time advances by
one hour.
OFF: Return to the ordinary time.